/**
* @brief this function handles TIM5 global interrupt request.
* @param none
* @retval none
*/
void WDT_Handler(void)
{
/* Clear status bit to acknowledge interrupt by dummy read. */
wdt_get_status(WDT);
/* Restart the WDT counter. */
wdt_restart(WDT);
}
/**
* \brief Handler for watchdog interrupt.
*/
void WDT_Handler(void)
{
puts("Enter watchdog interrupt.\r");
/* Clear status bit to acknowledge interrupt by dummy read. */
wdt_get_status(WDT);
/* Restart the WDT counter. */
wdt_restart(WDT);
puts("The watchdog timer was restarted.\r");
}
static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int status;
int new_options, retval = -EINVAL;
int new_timeout;
union {
struct watchdog_info __user *ident;
int __user *i;
} uarg;
uarg.i = (int __user *)arg;
switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user(uarg.ident, &ident,
sizeof(ident)) ? -EFAULT : 0;
case WDIOC_GETSTATUS:
wdt_get_status(&status);
return put_user(status, uarg.i);
case WDIOC_GETBOOTSTATUS:
return put_user(0, uarg.i);
case WDIOC_SETOPTIONS:
if (get_user(new_options, uarg.i))
return -EFAULT;
if (new_options & WDIOS_DISABLECARD) {
wdt_stop();
retval = 0;
}
if (new_options & WDIOS_ENABLECARD) {
wdt_start();
retval = 0;
}
return retval;
case WDIOC_KEEPALIVE:
wdt_keepalive();
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_timeout, uarg.i))
return -EFAULT;
if (wdt_set_timeout(new_timeout))
return -EINVAL;
wdt_keepalive();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(timeout, uarg.i);
default:
return -ENOTTY;
}
}
static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
int new_heartbeat;
int status;
static struct watchdog_info ident = {
.options = WDIOF_SETTIMEOUT|
WDIOF_MAGICCLOSE|
WDIOF_KEEPALIVEPING,
.firmware_version = 1,
.identity = "WDT500/501",
};
/* Add options according to the card we have */
ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
#ifdef CONFIG_WDT_501
ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER);
if (tachometer)
ident.options |= WDIOF_FANFAULT;
#endif /* CONFIG_WDT_501 */
switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
case WDIOC_GETSTATUS:
wdt_get_status(&status);
return put_user(status, p);
case WDIOC_GETBOOTSTATUS:
return put_user(0, p);
case WDIOC_KEEPALIVE:
wdt_ping();
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_heartbeat, p))
return -EFAULT;
if (wdt_set_heartbeat(new_heartbeat))
return -EINVAL;
wdt_ping();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(heartbeat, p);
default:
return -ENOTTY;
}
}
/**
* wdt_open:
* @inode: inode of device
* @file: file handle to device
*
* The watchdog device has been opened. The watchdog device is single
* open and on opening we load the counters. Counter zero is a 100Hz
* cascade, into counter 1 which downcounts to reboot. When the counter
* triggers counter 2 downcounts the length of the reset pulse which
* set set to be as long as possible.
*/
static int wdt_open(struct inode *inode, struct file *file)
{
if (test_and_set_bit(0, &wdt_is_open))
return -EBUSY;
/*
* Activate
*/
wdt_start();
return nonseekable_open(inode, file);
}
/**
* wdt_release:
* @inode: inode to board
* @file: file handle to board
*
* The watchdog has a configurable API. There is a religious dispute
* between people who want their watchdog to be able to shut down and
* those who want to be sure if the watchdog manager dies the machine
* reboots. In the former case we disable the counters, in the latter
* case you have to open it again very soon.
*/
static int wdt_release(struct inode *inode, struct file *file)
{
if (expect_close == 42) {
wdt_stop();
clear_bit(0, &wdt_is_open);
} else {
printk(KERN_CRIT
"wdt: WDT device closed unexpectedly. WDT will not stop!\n");
wdt_ping();
}
expect_close = 0;
return 0;
}
#ifdef CONFIG_WDT_501
/**
* wdt_temp_read:
* @file: file handle to the watchdog board
* @buf: buffer to write 1 byte into
* @count: length of buffer
* @ptr: offset (no seek allowed)
*
* Temp_read reports the temperature in degrees Fahrenheit. The API is in
* farenheit. It was designed by an imperial measurement luddite.
*/
static ssize_t wdt_temp_read(struct file *file, char __user *buf,
size_t count, loff_t *ptr)
{
int temperature;
if (wdt_get_temperature(&temperature))
return -EFAULT;
if (copy_to_user(buf, &temperature, 1))
return -EFAULT;
return 1;
}
